What is what area code is 513?

Area code 513 serves the southwestern corner of the state of Ohio in the United States. It primarily covers the city of Cincinnati and its surrounding areas, including most of Hamilton County. It also includes portions of Butler, Clermont, and Warren counties. 513 was one of the original area codes created in 1947. As the population grew, the area code was split, but Cincinnati retained 513. Because of the increasing number of phone lines, an overlay area code, 828, was introduced in 2023 to serve the same geographic area. This means that local calls within the 513/828 area require ten-digit dialing (area code + number).